A polluted day in London

Animated sequence of nitrogen dioxide concentrations over the city of London during a high-pollution event that occurred on 15 November 2000.
The major source of nitrogen dioxide pollution is road traffic, and the highest concentrations (deep red colour) can clearly be seen around the busiest roads during the morning and evening rush hours.
High nitrogen dioxide concentrations may trigger asthma attacks, or cause breathing difficulties for those with lung complaints or heart conditions.
This London pollution animation was produced by Cambridge Environmental Consultants (CERC), commissioned by Hackney Building Exploratory.